It might appear to most of us that this si going to be a dumbass question. Though, I spent an hour debating with my father in law how to time a 6.5 I told him : time first the engine. To do so, align the mark on the crankshaft gear with the one on the camshaft gear Then, rotate the crankshaft 360° counter clokwise. doing so, the mark on the cranshaft will be again at the same place, but the camshaft will have rotate 180° only, and the mark will sit on the opposite so, you're now ready to align with the IP gear so as to time the IP Timing is done. Am I correct or not ?